diff --git a/docs/iris/src/conf.py b/docs/iris/src/conf.py
index 630c8f0afa..d6745762d8 100644
--- a/docs/iris/src/conf.py
+++ b/docs/iris/src/conf.py
@@ -267,6 +267,7 @@ def autolog(message):
     "http://schacon.github.com/git",
     "https://github.com/SciTools/iris/pull",
     "https://github.com/SciTools/iris/issue",
+    "http://cfconventions.org",
 ]
 
 # list of sources to exclude from the build.